WTK Does cutting S12 receiver for PG nut weaken receiver?

I have cut a hole in my Saiga12 receiver to place a stock pistol grip nut and note there is now only about a 1/4 inch strip of receiver between the PG nut hole and the original "sporter configuration" trigger slot in the rear of the receiver. Was wondering if that was at all a concern? Was wondering if anyone else used one of these reinforcing plates as pictured below